const httpHeaders={
  'access-control-allow-credentials': "true",
  'access-control-allow-headers': "CONTENT-TYPE,DEVICE-ID,TICKET,BASE64",
  'access-control-allow-methods': "OPTIONS,GET,POST",
  'access-control-allow-origin': "https://time.geekbang.org",
  'access-control-expose-headers': "SET-TICKET",
  'access-control-max-age': "3600",
  'connection': "keep-alive",
  'content-type': "application/json",
  'date': "Sat, 25 Apr 2020 07:08:51 GMT",
  'strict-transport-security': "max-age=15768000",
  'transfer-encoding': "chunked",
};